Grate for furnaces.



E. W. F McMILLAN.

GRATE FOR FURNACES.

APPLICATION FILED JAN. 5. 1916.

Patented Apr. 9, 1918.

A5 WITNESS S:

ATTORNEY -ELI w. F. MOMILLAN', or EVERETT, WASHINGTON.

GRATE non ronnAons.

Specification of Letters Patent.

Patented Apr. 9, 1918.

Application filed January 5, 1916. Serial No. 70,545.

To all whom it may concern:

Be it known that I, ELI W. F. MCMILLAN, a citizen of the United States, residing at Everett, in the county of Snohomish and State of Washington, have invented a new and useful Improvement in Grates for Furnaces, of which the following is a specification.

This invention relates to improvements in grates for furnaces, refuse burners and the like, and the object of this improvement is to provide a sectional grate of strong and simple construction that is so formed that ashes and clinkers or fuel can not settle down as a blanket thereon and close the draft openings through the grate.

This invention consists in the novel form of construction of a grate as will be more clearly described in the following specification, illustrated in the accompanying drawings and finally pointed out in they appended. claim.

In the drawings Figure 1 is a view in cross section. of three sections of a grate embodying this invention; Fig. 2, is a View in longitudinal midsection of one section of the same; Fig. 3, is a view in perspective of one section of a modified form of the invention; and Fig. 4 is an enlarged view in cross section of the form of grate shown in Fig. 3.

Referring to the several views throughout which like reference numerals indicate like parts, the numeral 5 indicates one section of a grate which may be considered as built up of a base portion 6 and a top portion 7.

The top portion 7 is made up of two intersecting walls that form an apex or gable 8 upon which the fuel rests, and such walls are provided with longitudinal slots 9 through which air may pass to support combustion, the slots 9 preferably being narrower at the top than they are at the bottom and being formed at an angle to the plane of the walls so that they are substan tially vertical when the grate is set up.

The base 6 of each grate section 5 terminates at each end in a squared portion 10 that is adapted to rest upon a support (not shown) and the top portion 7 of each grate section is inclined outwardly from top to bottom, as indicated at 14 and is also provided with slots 9 through which air may ass.

p The side walls of the base portion 6 of each section converge slightly toward the bottom ofthe section and are each provided with external spacing members 11 having vertical faces that coengage when two or more sections 5 are placed side by side, thus ausing a slot that converges slightly toward the top to be left between adjacent grate sections.

A bridge 12may be placed in the center of each grate bar if desired, and the slots 9 may be relatively short in length with transverse ribs 13 therebetween to strengthen the grate section.

When in use a plurality of the sections 5 are placed side by side within a furnace to form a grate which consists in a series of gables 8 upon which the fuel may rest with troughs between the adjacent gables, the grate when viewed in cross section as shown in Fig. 1 presenting a serrated or sawtoothed appearance.

In Figs. 8 and 4t I have shown a grate section having the same general shape as the section 5 and consisting in a frame 15 having slots 16 in each end wherein bars 17 may be placed to extend lengthwise thereof and form a grating. The bars 17 are tapered toward the bottom edge thereof in order vided with spacing members 18 similar to the spacing members 11 whereby a draft slot will be left in the bottom of the trough that is formed when several grate sections are placed side by side.

It will be noted in Figs. 3 and 4 that the top of each of the bars 17 is fiat and lies substantially in a horizontal plane instead of lying in the general inclined plane of the top portion of the grate section. This makes it still more difficult for ashes, fuel and clinkers to settle down on the grate and shut OK the draft.

If one or more of the bars 17 are broken or burned out, they may readily be replaced without replacing the entire grate section.

The advantage of my form of grate in ers, fuel and ashes as they settle thereon will rest upon the gables 8 and will be broken up thereby and fall through the openings 9 or the spaces between the bars 17 as they slide down the angular vars-11s of the top of the grate sections instead of forming a blanket on the grate that" closes'the" draft as often occurs in an ordinary fiat grate;

I have found by experiment that the use of this grate in refuse burners that are con- 'nect'ed with lumber'm'ills' greatly increases the eflicien'oy' of a burner and causes praoti-' Cally all of the refuse that is directed therefint'o to-be consumed Without attention While Where an o'rdnia'r'ylfiat grate is used a great amount of ashes and clinkers is formed,- and these ashes and clinkers, together With the unconsumed fuel, Will settle down onthe grate"and shut off the draft in a short time.

Obyiou'sly my grate may be made in one oal perforations.

solid piece if desired, but for large grates it is found to'be morepractical to build the grate in sections.

' Haring described my invention What I' Signed'by me; at Eyerett, Washington, this 27th day of'December,19l5;; a y

ELI VVQF. MCMILLAN. WVitnesses: GzA. DONOGH'UE, M. A. GUSTAFSON.

cane-"5: thifpfite'nt may be obtained for fivejcent'sze aclai, the dbliiliii ssloner of Patents, washm'gtnmncr 

